Indonesia sits close to the equator. This means it has an equatorial and tropical climate, and there are generally two major seasons in Indonesia. The first is the dry season, which runs from May to November and December. There are few rainy days, and it's the perfect time to visit Indonesia. In contrast, the rainy season is from January to April, with considerable rainfall. Humidity can reach 75% during this period. January and February see some of the country's highest temperatures and humidity. Here is an overview of the climate in different parts of Indonesia.
Bali's dry season is from April to October. Coinciding with our school holidays, July and August are a popular time to visit Bali, especially as the maximum average temperature is close to 31°C. The periods from April to June, or even from October to November, are also a good time to visit, as sunshine levels are high and it is before the significant rainfall arrives (rainfall slightly above three inches in October, as in June). At these times, the maximum average temperature will also be 31°C. The monsoon season in Bali, from November to February, sees fairly heavy rainfall, but for relatively short periods. Unlike Vietnam, which is not far away, Bali's rainy season doesn't mean continuous rainfall.
Sulawesi (also known as Celebes) has a climate that varies depending on the latitude. In the north, the climate is equatorial, while in the south it is tropical and humid. The maximum average temperature on Sulawesi ranges from 30° to 32°C throughout the year, while the minimum average range is between 23° and 24°C. The dry season (July to October) is much more pronounced on the north side of the island, while the monsoon season runs from November to June. However, it's worth noting that on the north side and the central part of the island, there is a fairly even spread of rainfall throughout the year. To the south of the island, the dry season is more extensive, from May to October, while the monsoon season is concentrated from November to April. The southern part, and especially the south-eastern peninsula, is the driest part of the island.
Java has a hot and humid equatorial climate. This type of climate delivers year-round temperatures of between 25°C and 32°C. The climate is softened slightly by the proximity of the Java Sea and Indian Ocean. The dry season in Java runs from April to October, while the rainy season is from November to March. The wettest part of Java is to the west. As elsewhere in Java, rains can sometimes turn into thunderstorms, but often don't last long. Rainfall is generally concentrated in the mid to late afternoon.
Lombok's climate is quite similar to that in Bali. However, the weather is drier here, with temperatures ranging from 25°C in the dry season to more than 32°C in the middle of the rainy season. Unsurprisingly, there is a cooler climate in Lombok's mountainous regions with the maximum average temperature ranging between 20° and 25°C. As in other parts of Indonesia, Lombok's dry season runs from March to October, while the monsoon season lasts from November to April. December and February are the wettest months of the year in Lombok. The rain can even put in an appearance in the dry season, especially in the western part of Lombok.
In Indonesia, the island of Sumatra experiences significant rainfall. Rain and heat are a constant throughout the year. The island of Sumatra has a tropical climate. As in most other parts of Indonesia, there are identifiable main seasons. Firstly, there is the dry season, running from May to September, with only occasional rainfall. Throughout the remainder of the year (April to October), Sumatra has a very humid climate, and the winter months see high levels of rainfall. Humidity levels on the island of Sumatra never drop below 80% in any season.